Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

41.

The treatment of snake-bite by antivenom is an example of

  • artificially acquired active immunity

  • artificially acquired passive immunity

  • naturally acquired passive immunity

  • specific natural immunity.


42.

DNA is present in

  • chromosomes and dictyosomes

  • chloroplasts and lysosomes

  • mitochondria and chloroplasts

  • mitochondria and endoplasmic reticulum.


43.

Potato and sweet potato

  • have edible parts which are homologous organs

  • have edible parts which are analogous organs

  • have been introduced in India from the same place

  • are two species of the same genus.


44.

Somaclonal variation can be obtained by

  • application of colchicine

  • irradiation with gamma rays

  • tissue culture

  • hybridisation.


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45.

Which of the following is the largest root parasite

  • Rafflesia

  • Monotrapa

  • Areuthobium

  • Pistia


46.

How many different types of gametes can be formed by F1 progeny, resulting from the following cross

AA BB CC x aa bb cc

  • 3

  • 8

  • 27

  • 64


47.

Assertion: Agricultural output increased several times after introduction of DDT.

Reason: DDT was the first insecticide used on a wide scale.

  • If both Assertion and Reason are true and Reason is the correct explanation of Assertion

  • If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

  • If Assertion is true but Reason is false

  • If both Assertion and Reason are false.


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48.

Assertion: Coaccrvates are believed to be the precursors of life.

Reason: Coaccrvates were self-duplicating aggregates of proteins surrounded by lipid molecules

  • If both Assertion and Reason are true and Reason is the correct explanation of Assertion

  • If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

  • If Assertion is true but Reason is false

  • If both Assertion and Reason are false.


C.

If Assertion is true but Reason is false

A coacervate is a spherical aggregation of lipid molecules making up a colliodal inclusion which is held together by hydrophobic forces. Coacervates measure 1 to 100 micrometers across, possess osmotic properties , and form spontaneously from certain weak organic solutions. Their name derives from the Latin coacervare, meaning to assemble together or cluster. It was suggested by Oparin that coacervates may have played a significant role in the evolution of cells.


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49.

Assertion: Tapeworm, roundworm and pinworm are endoparasites of human intestine.,

Reason: Improperly cooked food is the source of all intestinal infections.

  • If both Assertion and Reason are true and Reason is the correct explanation of Assertion

  • If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

  • If Assertion is true but Reason is false

  • If both Assertion and Reason are false.


50.

Assertion: Fish meal is a rich source of protein for cattle and poultry.

Reason: Fish meal is produced from non-edible parts of fishes like fins, tail etc.

  • If both Assertion and Reason are true and Reason is the correct explanation of Assertion

  • If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

  • If Assertion is true but Reason is false

  • If both Assertion and Reason are false.


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